RK3399 Android7.1 异形屏修改

属性说明：
persist.sys.framebuffer.xoffset //用来调整水平方向偏移
persist.sys.framebuffer.yoffset //用来调整垂直方向偏移
persist.sys.framebuffer.main //用来设置上层应用的渲染布局，这个属性值与裁剪屏尺寸相关，例如可显示区域为 1920x400，那么就设置为 1920x400@60 即可。
sys.hwc.compose_policy=0 //裁剪屏建议关闭HWC，否则在一些场景显示会出现偏差出现抖屏的情况，修改方法可将build.prop文件中的该字段修改为 0，默认值为 6

HWC_DISPLAY_PRIMARY = 0,
HWC_DISPLAY_EXTERNAL = 1, // HDMI, EDP

hardware ockchiphwcomposerhwcomposer.cpp 

static int hwc_get_display_configs(struct hwc_composer_device_1 *dev,
                                   int display, uint32_t *configs,
                                   size_t *num_configs) {
  if (!num_configs)
    return 0;

  struct hwc_context_t *ctx = (struct hwc_context_t *)&dev->common;
  DrmConnector *connector = ctx->drm.GetConnectorFromType(display);
  if (!connector) {
    ALOGE("%s:Failed to get connector for display %d line=%d", __FUNCTION__,display,__LINE__);
    return -ENODEV;
  }

  hwc_drm_display_t *hd = &ctx->displays[connector->display()];
  if (!hd->active)
    return -ENODEV;

  int ret = connector->UpdateModes();
  if (ret) {
    ALOGE("Failed to update display modes %d", ret);
    return ret;
  }

  if (connector->state() != DRM_MODE_CONNECTED && display == HWC_DISPLAY_EXTERNAL) {
    ALOGE("connector is not connected with display %d", display);
    return -ENODEV;
  }

  update_display_bestmode(hd, display, connector);
  DrmMode mode = connector->best_mode();
  connector->set_current_mode(mode);

  char framebuffer_size[PROPERTY_VALUE_MAX];
  uint32_t width = 0, height = 0 , vrefresh = 0 ;
  if (display == HWC_DISPLAY_PRIMARY)
    property_get("persist." PROPERTY_TYPE ".framebuffer.main", framebuffer_size, "use_baseparameter");
  else if(display == HWC_DISPLAY_EXTERNAL)
    property_get("persist." PROPERTY_TYPE ".framebuffer.aux", framebuffer_size, "use_baseparameter");

android7.1_异形屏修改

0.dts中配置1920x1080的分辨率
1.build.prop添加下面属性：
persist.sys.framebuffer.main=1920x600@60  
2.hardware/rockchip/hwcomposer合入下面修改：
diff --git a/hwcomposer.cpp b/hwcomposer.cpp
index 0fd2177..3ad13a9 100755
--- a/hwcomposer.cpp
+++ b/hwcomposer.cpp
@@ -3498,8 +3498,10 @@ static int hwc_get_display_configs(struct hwc_composer_device_1 *dev,

   char framebuffer_size[PROPERTY_VALUE_MAX];
   uint32_t width = 0, height = 0 , vrefresh = 0 ;
+  if (display == HWC_DISPLAY_PRIMARY)
   property_get("persist.sys.framebuffer.main", framebuffer_size, "use_baseparameter");
-
+  else if(display == HWC_DISPLAY_EXTERNAL)
+  property_get("persist.sys.framebuffer.aux", framebuffer_size, "use_baseparameter");
   /*
    * if unset framebuffer_size, get it from baseparameter , by libin
    */

@@ -2298,7 +2301,8 @@ static int hwc_prepare(hwc_composer_device_1_t *dev, size_t num_displays,
     hd->rel_yres = mode.v_display();
     hd->v_total = mode.v_total();
     hd->w_scale = (float)mode.h_display() / hd->framebuffer_width;
-    hd->h_scale = (float)mode.v_display() / hd->framebuffer_height;
+    //hd->h_scale = (float)mode.v_display() / hd->framebuffer_height;
+    hd->h_scale = 1.0;
     int fbSize = hd->framebuffer_width * hd->framebuffer_height;
     //get plane size for display
     std::vector<PlaneGroup *>& plane_groups = ctx->drm.GetPlaneGroups();
@@ -3638,7 +3647,8 @@ static int hwc_set_active_config(struct hwc_composer_device_1 *dev, int display,
     return -ENOENT;
   }
   hd->w_scale = (float)mode.h_display() / hd->framebuffer_width;
-  hd->h_scale = (float)mode.v_display() / hd->framebuffer_height;
+  //hd->h_scale = (float)mode.v_display() / hd->framebuffer_height;
+  hd->h_scale = 1.0;

   c->set_current_mode(mode);
   ctx->drm.UpdateDisplayRoute();